Validating username and password in servlet
c) The service() method throws two checked exceptions of javax.servlet. Using get Parameter() method, the programmer extracts all the data sent by the client.
The other way is get Parameter Names() where all the data is extracted in a single stretch in a for loop. out.close(); When the job is over, it is customary to close the streams as you have done in file copying.
When the HTTP became a defacto standard for Web, Http Servlet was designed to suit more for HTTP protocol.
Http Servlet is an abstact class but without any abstract methods (all are non-abstract methods).
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums Hello, I have a JSP Registration page where the user inserts the username,password,address etc into the database.
After submitting the page,the login page appears where i have to enter the username and password.
Now i want to check the username and password i entered in the text boxes with the values in the database. I have tried it in the servlet from the database side with the query as shown below but i am not able to get it.
We use Servlet Response as parameter when we extend Generic Servlet and Http Servlet Response when Http Servlet is extended. This string message (here, VALID OR INVALID) is ultimately sent to client by the Http Servlet Response. String str1 = Parameter("t1"); We know the data sent by client (known as request) finally reaches Http Servlet Request.Then compare with the password that you got from html page and the password from the query If the above is not working out, I recommend you to keep the presentation(view) in JSP, validation in a servlet.Also keep the dbase connections in a separate class.Even the service() method is non-abstract and infact with Http Servlet, the service() method can be replaced by the methods do Get() or do Post(). The above code works fine even if Generic Servlet is extended instead of Http Servlet. public void service(Http Servlet Request req, Http Servlet Response res) throws Servlet Exception, IOException service() method is a callback method called automatically when the container loads the servlet for execution when the client request comes.The method takes two parameters – an object of interface Http Servlet Request and an object of interface Http Servlet Response and let us see what these interfaces meant to servlet.